linux-kernel - [PATCH v3 0/7] ACPI / hotplug / PCI: Consolidation of ACPIPHP with ACPI core device hotplug

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Date:	Sun, 02 Feb 2014 18:11:19 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, Aaron Lu <aaron.lu@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Robert Moore <robert.moore@...el.com>
Subject: [PATCH v3 0/7] ACPI / hotplug / PCI: Consolidation of ACPIPHP with ACPI core device hotplug

On Sunday, February 02, 2014 01:52:26 AM Rafael J. Wysocki wrote:
> On Wednesday, January 29, 2014 12:57:06 AM Rafael J. Wysocki wrote:
> > On Tuesday, January 28, 2014 11:10:30 PM Rafael J. Wysocki wrote:
> > > Hi All,
> > > 
> > > It looks like there's time for more adventurous stuff. :-)
> > > 
> > > The following series is on top of the one I sent on Sunday:
> > > 
> > > https://lkml.org/lkml/2014/1/26/191
> > > 
> > > The final outcome of the patches below is that all ACPI hotplug notifications
> > > for PCI devices and for core system things like CPU, memory, PCI roots etc.,
> > > will be dispatched from acpi_bus_notify() and it is not necessary to install a
> > > separate hotplug notify handler for each device any more.
> > > 
> > > [1/5] Attach ACPIPHP hotplug contexts to struct acpi_device objects.
> > > [2/5] Introduce wrappers for installing and removing hotplug notify handlers
> > >       (those wrappers go away later on, but they are useful for separating
> > >        changes).
> > > [3/5] Consolidate ACPI hotplug signaling for PCI and ACPI core.
> > > [4/5] Simplify notify handle registration wrapper.
> > > [5/5] Dispatch ACPI hotplug notifications for "core" devices and PCI from acpi_bus_notify().
> > 
> > Unfortunately, I realized that patches [3-5/5] were buggy.  The bugs were
> > kind of subtle and might not be easy to reproduce, but they were bugs anyway. :-)
> > 
> > A respin of the whole series follows.
> 
> After the Mika's testing it turned out that they were more buggy than I had
> though.  Oh well.
> 
> The following patchset is a reworked version of the previous one.  Functionality-wise
> the final result should be very similar, but not exactly the same.
> 
> [1/6] Fix a theoretical race condition in acpi_hotplug_notify_cb().
> [2/6] Move the hotplug context lock definition to the ACPI core (from ACPIPHP).
> [3/6] Consolidate ACPI hotplug signaling for PCI and ACPI core (this is a combination
>       of patches [1-3/5] from the previous series).
> [4/6] Rework the handling of eject requests in the ACPI core.
> [5/6] Simplify a routine for installing hotplug notify handlers.
> [6/6] Dispatch ACPI hotplug notifications for "core" devices and PCI from acpi_bus_notify().
> 
> This is on top of https://lkml.org/lkml/2014/2/1/123 which in turn is on top of
> the current mainline.
> 
> For the adventurous all this stuff is on the test-next branch of linux-pm.git.

As stated in the message at http://marc.info/?l=linux-acpi&m=139135963030012&w=4 ,
patch [1/6] was actaully wrong and the whole patchset had to be reworked for that
reason.  What follows is an entirely new version:

[1/7] Add a new function to ACPICA allowing a callback to be executed under the
      namespace mutex after calling acpi_ns_get_attached_data().

[2/7] Use the new ACPICA's function to fix a couple of potential races related
      to ACPI notifies.

[3/7] Same as [2/6] above.
[4/7] Same as [3/6] above, rebased.
[5/7] Same as [4/6] above.
[6/7] Same as [5/6] above.
[7/7] Dispatch ACPI hotplug notifications for "core" devices and PCI from
      acpi_bus_notify().  This actually is different from [6/6] above, although
      it serves the same purpose.

Thanks!

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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